for i in range(100):
    print(i)
    if i == 50:
        break
else:
    print("。。。")

# for ...else
# 当循环正常结束，else就会执行，当非正常结束得时候,else就不会执行
for i in range(2,101):
    # 41
    # 41 % 2
    # 41 % 3
    # 41 % 4
    # 41 % 48
    for j in range(2,i):
        if i % j == 0:
            break
    else:
        print(i)
